A charming flea market shop dedicated to retrofuturistic apparati.

An antique curios dealer and hybrid taxidermist.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

This lesser-known Frank Gehry building houses a treasure trove of cinema history.

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

The curious underground history of keeping Paris clean.

A unrivaled and rather horrifying collection of wax dermatological models.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

France's national museum of scientific and industrial instruments.

This museum houses an imposing skeleton army comprised of creatures great and small.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

A haunting collection of the vanished and disappearing natural world.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

The oldest stone house in Paris was built by its most famous alchemist.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

The last four extravagant street signs of London's historic banking street.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.